#define SIGPROP
#include <sys/param.h>
#include <sys/signalvar.h>
#include <sys/resourcevar.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/timeb.h>
#include <sys/times.h>
#include <sys/buf.h>
#include <sys/acct.h>
#include <sys/file.h>
#include <sys/kernel.h>
#include <sys/wait.h>
#include <sys/ktrace.h>
#include <sys/syslog.h>
#include <sys/stat.h>
#include <sys/lock.h>
#include <sys/mount.h>
#include <kern/cpu_number.h>
#include <sys/vm.h>
#include <sys/user.h>
#include <kern/ast.h>
#include <kern/thread.h>
#include <kern/thread_call.h>
void stop __P((struct proc *p));
int cansignal __P((struct proc *, struct pcred *, struct proc *, int));
int killpg1 __P((struct proc *, int, int, int));
void sigexit_locked __P((struct proc *, int));
void setsigvec __P((struct proc *, int, struct sigaction *));
void exit1 __P((struct proc *, int, int *));
int signal_lock __P((struct proc *));
int signal_unlock __P((struct proc *));
void signal_setast __P((thread_act_t *));
void signal_clearast __P((thread_act_t *));
void psignal_lock __P((struct proc *, int, int, int));
#if SIGNAL_DEBUG
void ram_printf __P((int));
int ram_debug=0;
unsigned int rdebug_proc=0;
void
ram_printf(int x)
{
printf("x is %d",x);
}
#endif
int
signal_lock(struct proc *p)
{
int error = 0;
#if SIGNAL_DEBUG
#ifdef __ppc__
{
int register sp, *fp, numsaved;
__asm__ volatile("mr %0,r1" : "=r" (sp));
fp = (int *)*((int *)sp);
for (numsaved = 0; numsaved < 3; numsaved++) {
p->lockpc[numsaved] = fp[2];
if ((int)fp <= 0)
break;
fp = (int *)*fp;
}
}
#endif
#endif
siglock_retry:
error = lockmgr(&p->signal_lock, LK_EXCLUSIVE, 0, (struct proc *)0);
if (error == EINTR)
goto siglock_retry;
return(error);
}
int
signal_unlock(struct proc *p)
{
#if SIGNAL_DEBUG
#ifdef __ppc__
{
int register sp, *fp, numsaved;
__asm__ volatile("mr %0,r1" : "=r" (sp));
fp = (int *)*((int *)sp);
for (numsaved = 0; numsaved < 3; numsaved++) {
p->unlockpc[numsaved] = fp[2];
if ((int)fp <= 0)
break;
fp = (int *)*fp;
}
}
#endif
#endif
return(lockmgr(&p->signal_lock, LK_RELEASE, (simple_lock_t)0, (struct proc *)0));
}
void
signal_setast(sig_actthread)
thread_act_t *sig_actthread;
{
thread_ast_set(sig_actthread, AST_BSD);
if ((thread_act_t *)current_act() == sig_actthread)
ast_on(AST_BSD);
}
void
signal_clearast(sig_actthread)
thread_act_t *sig_actthread;
{
thread_ast_clear(sig_actthread, AST_BSD);
if ((thread_act_t *)current_act() == sig_actthread)
ast_off(AST_BSD);
}
int
cansignal(p, pc, q, signum)
struct proc *p;
struct pcred *pc;
struct proc *q;
int signum;
{
if (pc->pc_ucred->cr_uid == 0)
return (1);
if (signum == SIGCONT && q->p_session == p->p_session)
return (1);
if (q->p_flag & P_SUGID) {
switch (signum) {
case 0:
case SIGKILL:
case SIGINT:
case SIGTERM:
case SIGSTOP:
case SIGTTIN:
case SIGTTOU:
case SIGTSTP:
case SIGHUP:
case SIGUSR1:
case SIGUSR2:
if (pc->p_ruid == q->p_cred->p_ruid ||
pc->pc_ucred->cr_uid == q->p_cred->p_ruid ||
pc->p_ruid == q->p_ucred->cr_uid ||
pc->pc_ucred->cr_uid == q->p_ucred->cr_uid)
return (1);
}
return (0);
}
if (pc->p_ruid == q->p_cred->p_ruid ||
pc->p_ruid == q->p_cred->p_svuid ||
pc->pc_ucred->cr_uid == q->p_cred->p_ruid ||
pc->pc_ucred->cr_uid == q->p_cred->p_svuid ||
pc->p_ruid == q->p_ucred->cr_uid ||
pc->pc_ucred->cr_uid == q->p_ucred->cr_uid)
return (1);
return (0);
}
struct sigaction_args {
int signum;
struct sigaction *nsa;
struct sigaction *osa;
};
int
sigaction(p, uap, retval)
struct proc *p;
register struct sigaction_args *uap;
register_t *retval;
{
struct sigaction vec;
register struct sigaction *sa;
register struct sigacts *ps = p->p_sigacts;
register int signum;
int bit, error;
signum = uap->signum;
if (signum <= 0 || signum >= NSIG ||
signum == SIGKILL || signum == SIGSTOP)
return (EINVAL);
sa = &vec;
if (uap->osa) {
sa->sa_handler = ps->ps_sigact[signum];
sa->sa_mask = ps->ps_catchmask[signum];
bit = sigmask(signum);
sa->sa_flags = 0;
if ((ps->ps_sigonstack & bit) != 0)
sa->sa_flags |= SA_ONSTACK;
if ((ps->ps_sigintr & bit) == 0)
sa->sa_flags |= SA_RESTART;
if (p->p_flag & P_NOCLDSTOP)
sa->sa_flags |= SA_NOCLDSTOP;
if (error = copyout((caddr_t)sa, (caddr_t)uap->osa,
sizeof (vec)))
return (error);
}
if (uap->nsa) {
if (error = copyin((caddr_t)uap->nsa, (caddr_t)sa,
sizeof (vec)))
return (error);
setsigvec(p, signum, sa);
}
return (0);
}
static int
reset_sigbits(thread_act_t th_act, int bit)
{
struct uthread *ut;
ut = get_bsdthread_info(th_act);
if (ut) {
ut->uu_sig &= ~bit;
}
}
int
clear_sigbits (struct proc *p, int bit)
{
task_t task = p->task;
p->p_siglist &= ~(bit);
task_act_iterate_wth_args(task, reset_sigbits, bit);
return(0);
}
void
setsigvec(p, signum, sa)
register struct proc *p;
int signum;
register struct sigaction *sa;
{
register struct sigacts *ps = p->p_sigacts;
register int bit;
bit = sigmask(signum);
ps->ps_sigact[signum] = sa->sa_handler;
ps->ps_catchmask[signum] = sa->sa_mask &~ sigcantmask;
if ((sa->sa_flags & SA_RESTART) == 0)
ps->ps_sigintr |= bit;
else
ps->ps_sigintr &= ~bit;
if (sa->sa_flags & SA_ONSTACK)
ps->ps_sigonstack |= bit;
else
ps->ps_sigonstack &= ~bit;
if (sa->sa_flags & SA_USERTRAMP)
ps->ps_usertramp |= bit;
else
ps->ps_usertramp &= ~bit;
if (signum == SIGCHLD) {
if (sa->sa_flags & SA_NOCLDSTOP)
p->p_flag |= P_NOCLDSTOP;
else
p->p_flag &= ~P_NOCLDSTOP;
}
if (sa->sa_handler == SIG_IGN ||
(sigprop[signum] & SA_IGNORE && sa->sa_handler == SIG_DFL)) {
p->p_siglist &= ~bit;
if (bit & threadmask) {
register task_t task = p->task;
task_act_iterate_wth_args(task, reset_sigbits, bit);
}
if (signum != SIGCONT)
p->p_sigignore |= bit;
p->p_sigcatch &= ~bit;
} else {
p->p_sigignore &= ~bit;
if (sa->sa_handler == SIG_DFL)
p->p_sigcatch &= ~bit;
else
p->p_sigcatch |= bit;
}
}
void
siginit(p)
struct proc *p;
{
register int i;
for (i = 0; i < NSIG; i++)
if (sigprop[i] & SA_IGNORE && i != SIGCONT)
p->p_sigignore |= sigmask(i);
}
void
execsigs(p)
register struct proc *p;
{
register struct sigacts *ps = p->p_sigacts;
register int nc, mask;
while (p->p_sigcatch) {
nc = ffs((long)p->p_sigcatch);
mask = sigmask(nc);
p->p_sigcatch &= ~mask;
if (sigprop[nc] & SA_IGNORE) {
if (nc != SIGCONT)
p->p_sigignore |= mask;
p->p_siglist &= ~mask;
}
ps->ps_sigact[nc] = SIG_DFL;
}
ps->ps_sigstk.ss_flags = SA_DISABLE;
ps->ps_sigstk.ss_size = 0;
ps->ps_sigstk.ss_sp = 0;
ps->ps_flags = 0;
}
struct sigprocmask_args {
int how;
sigset_t mask;
};
int
sigprocmask(p, uap, retval)
register struct proc *p;
struct sigprocmask_args *uap;
register_t *retval;
{
int error = 0;
*retval = p->p_sigmask;
switch (uap->how) {
case SIG_BLOCK:
p->p_sigmask |= uap->mask &~ sigcantmask;
break;
case SIG_UNBLOCK:
p->p_sigmask &= ~(uap->mask);
signal_setast(current_act());
break;
case SIG_SETMASK:
p->p_sigmask = uap->mask &~ sigcantmask;
signal_setast(current_act());
break;
default:
error = EINVAL;
break;
}
return (error);
}
int
sigpending(p, uap, retval)
struct proc *p;
void *uap;
register_t *retval;
{
*retval = p->p_siglist;
return (0);
}
#if COMPAT_43
struct osigvec_args {
int signum;
struct sigvec *nsv;
struct sigvec *osv;
};
int
osigvec(p, uap, retval)
struct proc *p;
register struct osigvec_args *uap;
register_t *retval;
{
struct sigvec vec;
register struct sigacts *ps = p->p_sigacts;
register struct sigvec *sv;
register int signum;
int bit, error;
signum = uap->signum;
if (signum <= 0 || signum >= NSIG ||
signum == SIGKILL || signum == SIGSTOP)
return (EINVAL);
sv = &vec;
if (uap->osv) {
*(sig_t *)&sv->sv_handler = ps->ps_sigact[signum];
sv->sv_mask = ps->ps_catchmask[signum];
bit = sigmask(signum);
sv->sv_flags = 0;
if ((ps->ps_sigonstack & bit) != 0)
sv->sv_flags |= SV_ONSTACK;
if ((ps->ps_sigintr & bit) != 0)
sv->sv_flags |= SV_INTERRUPT;
if (p->p_flag & P_NOCLDSTOP)
sv->sv_flags |= SA_NOCLDSTOP;
if (error = copyout((caddr_t)sv, (caddr_t)uap->osv,
sizeof (vec)))
return (error);
}
if (uap->nsv) {
if (error = copyin((caddr_t)uap->nsv, (caddr_t)sv,
sizeof (vec)))
return (error);
sv->sv_flags ^= SA_RESTART;
setsigvec(p, signum, (struct sigaction *)sv);
}
return (0);
}
struct osigblock_args {
int mask;
};
int
osigblock(p, uap, retval)
register struct proc *p;
struct osigblock_args *uap;
register_t *retval;
{
*retval = p->p_sigmask;
p->p_sigmask |= uap->mask &~ sigcantmask;
return (0);
}
struct osigsetmask_args {
int mask;
};
int
osigsetmask(p, uap, retval)
struct proc *p;
struct osigsetmask_args *uap;
register_t *retval;
{
*retval = p->p_sigmask;
p->p_sigmask = uap->mask &~ sigcantmask;
return (0);
}
#endif
int
sigcontinue(error)
{
unix_syscall_return(EINTR);
}
struct sigsuspend_args {
int mask;
};
int
sigsuspend(p, uap, retval)
register struct proc *p;
struct sigsuspend_args *uap;
register_t *retval;
{
register struct sigacts *ps = p->p_sigacts;
ps->ps_oldmask = p->p_sigmask;
ps->ps_flags |= SAS_OLDMASK;
p->p_sigmask = uap->mask &~ sigcantmask;
(void) tsleep0((caddr_t) p, PPAUSE|PCATCH, "pause", 0, sigcontinue);
return (EINTR);
}
#if COMPAT_43
struct osigstack_args {
struct sigstack *nss;
struct sigstack *oss;
};
int
osigstack(p, uap, retval)
struct proc *p;
register struct osigstack_args *uap;
register_t *retval;
{
struct sigstack ss;
struct sigacts *psp;
int error = 0;
psp = p->p_sigacts;
ss.ss_sp = psp->ps_sigstk.ss_sp;
ss.ss_onstack = psp->ps_sigstk.ss_flags & SA_ONSTACK;
if (uap->oss && (error = copyout((caddr_t)&ss,
(caddr_t)uap->oss, sizeof (struct sigstack))))
return (error);
if (uap->nss && (error = copyin((caddr_t)uap->nss,
(caddr_t)&ss, sizeof (ss))) == 0) {
psp->ps_sigstk.ss_sp = ss.ss_sp;
psp->ps_sigstk.ss_size = 0;
psp->ps_sigstk.ss_flags |= ss.ss_onstack & SA_ONSTACK;
psp->ps_flags |= SAS_ALTSTACK;
}
return (error);
}
#endif
struct sigaltstack_args {
struct sigaltstack *nss;
struct sigaltstack *oss;
};
int
sigaltstack(p, uap, retval)
struct proc *p;
register struct sigaltstack_args *uap;
register_t *retval;
{
struct sigacts *psp;
struct sigaltstack ss;
int error;
psp = p->p_sigacts;
if ((psp->ps_flags & SAS_ALTSTACK) == 0)
psp->ps_sigstk.ss_flags |= SA_DISABLE;
if (uap->oss && (error = copyout((caddr_t)&psp->ps_sigstk,
(caddr_t)uap->oss, sizeof (struct sigaltstack))))
return (error);
if (uap->nss == 0)
return (0);
if (error = copyin((caddr_t)uap->nss, (caddr_t)&ss,
sizeof (ss)))
return (error);
if (ss.ss_flags & SA_DISABLE) {
if (psp->ps_sigstk.ss_flags & SA_ONSTACK)
return (EINVAL);
psp->ps_flags &= ~SAS_ALTSTACK;
psp->ps_sigstk.ss_flags = ss.ss_flags;
return (0);
}
if (ss.ss_size < MINSIGSTKSZ)
return (ENOMEM);
psp->ps_flags |= SAS_ALTSTACK;
psp->ps_sigstk= ss;
return (0);
}
struct kill_args {
int pid;
int signum;
};
int
kill(cp, uap, retval)
register struct proc *cp;
register struct kill_args *uap;
register_t *retval;
{
register struct proc *p;
register struct pcred *pc = cp->p_cred;
if ((u_int)uap->signum >= NSIG)
return (EINVAL);
if (uap->pid > 0) {
if ((p = pfind(uap->pid)) == NULL)
return (ESRCH);
if (!cansignal(cp, pc, p, uap->signum))
return (EPERM);
if (uap->signum)
psignal(p, uap->signum);
return (0);
}
switch (uap->pid) {
case -1:
return (killpg1(cp, uap->signum, 0, 1));
case 0:
return (killpg1(cp, uap->signum, 0, 0));
default:
return (killpg1(cp, uap->signum, -(uap->pid), 0));
}
}
#if COMPAT_43
struct okillpg_args {
int pgid;
int signum;
};
int
okillpg(p, uap, retval)
struct proc *p;
register struct okillpg_args *uap;
register_t *retval;
{
if ((u_int)uap->signum >= NSIG)
return (EINVAL);
return (killpg1(p, uap->signum, uap->pgid, 0));
}
#endif
int
killpg1(cp, signum, pgid, all)
register struct proc *cp;
int signum, pgid, all;
{
register struct proc *p;
register struct pcred *pc = cp->p_cred;
struct pgrp *pgrp;
int nfound = 0;
if (all) {
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
p == cp || !cansignal(cp, pc, p, signum))
continue;
nfound++;
if (signum)
psignal(p, signum);
}
} else {
if (pgid == 0)
pgrp = cp->p_pgrp;
else {
pgrp = pgfind(pgid);
if (pgrp == NULL)
return (ESRCH);
}
for (p = pgrp->pg_members.lh_first; p != 0;
p = p->p_pglist.le_next) {
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
p->p_stat == SZOMB ||
!cansignal(cp, pc, p, signum))
continue;
nfound++;
if (signum)
psignal(p, signum);
}
}
return (nfound ? 0 : ESRCH);
}
void
gsignal(pgid, signum)
int pgid, signum;
{
struct pgrp *pgrp;
if (pgid && (pgrp = pgfind(pgid)))
pgsignal(pgrp, signum, 0);
}
void
pgsignal(pgrp, signum, checkctty)
struct pgrp *pgrp;
int signum, checkctty;
{
register struct proc *p;
if (pgrp)
for (p = pgrp->pg_members.lh_first; p != 0;
p = p->p_pglist.le_next)
if (checkctty == 0 || p->p_flag & P_CONTROLT)
psignal(p, signum);
}
void
threadsignal(sig_actthread, signum, code)
register thread_act_t *sig_actthread;
register int signum;
u_long code;
{
register struct uthread *uth;
register struct task * sig_task;
register struct proc *p ;
int mask;
if ((u_int)signum >= NSIG || signum == 0)
return;
mask = sigmask(signum);
if ((mask & threadmask) == 0)
return;
sig_task = get_threadtask(sig_actthread);
p = (struct proc *)(get_bsdtask_info(sig_task));
uth = get_bsdthread_info(sig_actthread);
if (uth && (uth->uu_flag & P_VFORK))
p = uth->uu_proc;
if (!(p->p_flag & P_TRACED) && (p->p_sigignore & mask))
return;
uth->uu_sig |= mask;
uth->uu_code = code;
p->p_siglist |= mask;
signal_setast(sig_actthread);
}
void
psignal_pend(p)
register struct proc *p;
{
boolean_t funnel_state;
register int sigbits, mask, signum;
thread_funnel_set(kernel_flock, TRUE);
if (p->p_sigpending == 0)
return;
signal_lock(p);
for (;;) {
sigbits = p->p_sigpending;
if (sigbits == 0)
goto out;
signum = ffs((long)sigbits);
mask = sigmask(signum);
p->p_sigpending &= ~mask;
psignal_lock(p, signum, 0, 0);
}
out:
p->p_flag &= ~P_SIGTHR;
signal_unlock(p);
thread_funnel_set(kernel_flock, FALSE);
}
void
psignal(p, signum)
register struct proc *p;
register int signum;
{
psignal_lock(p, signum, 1, 1);
}
void
psignal_vfork(p, new_task, thr_act, signum)
register struct proc *p;
task_t new_task;
thread_act_t thr_act;
register int signum;
{
int withlock = 1;
int pend = 0;
register int s, prop;
register sig_t action;
int mask;
kern_return_t kret;
if ((u_int)signum >= NSIG || signum == 0)
panic("psignal signal number");
mask = sigmask(signum);
prop = sigprop[signum];
#if SIGNAL_DEBUG
if(rdebug_proc && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
if ((new_task == TASK_NULL) || (thr_act == (thread_act_t)NULL) || is_kerneltask(new_task))
return;
signal_lock(p);
action = SIG_DFL;
if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
(p->p_flag & P_TRACED) == 0)
p->p_nice = NZERO;
if (prop & SA_CONT)
p->p_siglist &= ~stopsigmask;
if (prop & SA_STOP) {
if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 &&
action == SIG_DFL)
goto psigout;
p->p_siglist &= ~contsigmask;
}
p->p_siglist |= mask;
thread_ast_set(thr_act, AST_BSD);
if ((signum == SIGKILL) && (p->p_nice > NZERO)) {
p->p_nice = NZERO;
#if XXX
#endif
}
if (p->p_flag & P_TRACED) {
if (p->p_stat != SSTOP)
goto run;
else
goto psigout;
}
run:
if (p->p_stat == SSTOP) {
if ((p->p_flag & P_TRACED) != 0 && p->p_xstat != 0)
p->p_siglist |= sigmask(p->p_xstat);
}
p->p_stat = SRUN;
psigout:
signal_unlock(p);
}
void
psignal_lock(p, signum, withlock, pend)
register struct proc *p;
register int signum;
register int withlock;
register int pend;
{
register int s, prop;
register sig_t action;
thread_act_t sig_thread_act;
thread_t sig_thread;
register task_t sig_task;
register thread_t cur_thread;
thread_act_t *cur_act;
int mask;
kern_return_t kret;
int sw_funnel = 0;
if ((u_int)signum >= NSIG || signum == 0)
panic("psignal signal number");
mask = sigmask(signum);
prop = sigprop[signum];
#if SIGNAL_DEBUG
if(rdebug_proc && (p == rdebug_proc)) {
ram_printf(3);
}
#endif
if (thread_funnel_get() == (funnel_t *)network_flock) {
sw_funnel = 1;
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
}
if (((sig_task = p->task) == TASK_NULL) || is_kerneltask(sig_task)) {
if (sw_funnel)
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
return;
}
if (ISSET(p->p_flag, P_REBOOT)) {
if (sw_funnel)
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
return;
}
if (pend && (p->p_flag & P_TRACED) && p->sigwait) {
p->p_sigpending |= mask;
if (!(p->p_flag & P_SIGTHR)) {
p->p_flag |= P_SIGTHR;
thread_call_func((thread_call_func_t)psignal_pend, p,
FALSE);
}
if (sw_funnel)
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
return;
}
if (withlock)
signal_lock(p);
if (p->p_flag & P_TRACED)
action = SIG_DFL;
else {
if (p->p_sigignore & mask)
goto psigout;
if (p->p_sigmask & mask)
action = SIG_HOLD;
else if (p->p_sigcatch & mask)
action = SIG_CATCH;
else
action = SIG_DFL;
}
if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
(p->p_flag & P_TRACED) == 0)
p->p_nice = NZERO;
if (prop & SA_CONT)
p->p_siglist &= ~stopsigmask;
if (prop & SA_STOP) {
if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 &&
action == SIG_DFL)
goto psigout;
p->p_siglist &= ~contsigmask;
}
p->p_siglist |= mask;
if (action == SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP))
goto psigout;
cur_thread = current_thread();
cur_act = current_act();
if ((p->p_flag & P_INVFORK) && p->p_vforkact) {
sig_thread_act = p->p_vforkact;
kret = check_actforsig(sig_task, sig_thread_act, &sig_thread, 1);
if (kret == KERN_SUCCESS) {
goto psig_foundthread;
}
}
kret = (kern_return_t)get_signalact(sig_task,
&sig_thread_act, &sig_thread, 1);
if ((kret != KERN_SUCCESS) || (sig_thread_act == THREAD_NULL)) {
#if DIAGNOSTIC
printf("WARNING: no activation in psignal\n");
#endif
#if SIGNAL_DEBUG
ram_printf(1);
#endif
goto psigout;
}
psig_foundthread:
if (sig_thread == THREAD_NULL) {
#if DIAGNOSTIC
printf("WARNING: valid act; but no shutte in psignal\n");
#endif
#if 0
goto psigout;
#endif
}
if ((signum == SIGKILL) && (p->p_nice > NZERO)) {
p->p_nice = NZERO;
#if XXX
#endif
}
if (p->p_flag & P_TRACED) {
if (p->p_stat != SSTOP)
goto run;
else
goto psigout;
}
if (action != SIG_DFL) {
if (prop & SA_CONT)
(void) task_resume(sig_task);
goto run;
} else {
if (mask & stopsigmask) {
if (!(prop & SA_STOP) && p->p_pptr == initproc) {
psignal_lock(p, SIGKILL, 0, 1);
p->p_siglist &= ~mask;
goto psigout;
}
if (!is_thread_running(sig_thread)) {
p->p_siglist &= ~mask;
if (get_task_userstop(sig_task) == 0) {
p->p_xstat = signum;
if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0)
psignal(p->p_pptr, SIGCHLD);
stop(p);
}
#if 0
signal_clearast(sig_thread_act);
#endif
goto psigout;
} else {
if (p->p_stat != SZOMB)
signal_setast(cur_act);
goto psigout;
}
}
switch (signum) {
case SIGKILL:
p->p_stat = SRUN;
thread_abort(sig_thread_act);
goto psigout;
case SIGCONT:
if (p->p_flag & P_TTYSLEEP) {
p->p_flag &= ~P_TTYSLEEP;
wakeup(&p->p_siglist);
} else {
(void) task_resume(sig_task);
}
p->p_siglist &= ~mask;
p->p_stat = SRUN;
#if 0
signal_clearast(sig_thread_act);
#endif
goto psigout;
default:
goto run;
}
}
run:
if (p->p_stat == SSTOP) {
if ((p->p_flag & P_TRACED) != 0 && p->p_xstat != 0)
p->p_siglist |= sigmask(p->p_xstat);
}
p->p_stat = SRUN;
thread_abort_safely(sig_thread_act);
psigout:
if (withlock)
signal_unlock(p);
if (sw_funnel)
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
}
__inline__ void
sig_lock_to_exit(
struct proc *p)
{
thread_t self = current_thread();
p->exit_thread = self;
(void) task_suspend(p->task);
}
__inline__ int
sig_try_locked(
struct proc *p)
{
thread_t self = current_thread();
while (p->sigwait || p->exit_thread) {
if (p->exit_thread) {
if (p->exit_thread != self) {
thread_abort(current_act());
}
return(0);
}
if(assert_wait_possible()) {
assert_wait((caddr_t)&p->sigwait_thread,
(THREAD_INTERRUPTIBLE));
}
signal_unlock(p);
thread_block(0);
signal_lock(p);
if (thread_should_abort(self)) {
return -1;
}
}
return 1;
}
int
issignal(p)
register struct proc *p;
{
register int signum, mask, prop, sigbits;
task_t task = p->task;
thread_t cur_thread;
thread_act_t cur_act;
int s;
struct uthread * ut;
kern_return_t kret;
cur_thread = current_thread();
cur_act = current_act();
signal_lock(p);
if (sig_try_locked(p) <= 0) {
signal_unlock(p);
return (0);
}
ut = get_bsdthread_info(cur_act);
for(;;) {
sigbits = (ut->uu_sig |p->p_siglist) & ~p->p_sigmask;
if (p->p_flag & P_PPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) {
signal_unlock(p);
return (0);
}
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
if (mask & threadmask) {
ut->uu_sig &= ~mask;
}
if (mask & p->p_sigignore && (p->p_flag & P_TRACED) == 0) {
p->p_siglist &= ~mask;
continue;
}
if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
register int hold;
register task_t task;
p->p_xstat = signum;
psignal(p->p_pptr, SIGCHLD);
task = p->task;
task_hold(task);
p->sigwait = TRUE;
p->sigwait_thread = cur_act;
p->p_stat = SSTOP;
p->p_flag &= ~P_WAITED;
p->p_siglist &= ~mask;
wakeup((caddr_t)p->p_pptr);
assert_wait((caddr_t)&p->sigwait, (THREAD_INTERRUPTIBLE));
thread_block(0);
p->sigwait = FALSE;
p->sigwait_thread = NULL;
wakeup((caddr_t)&p->sigwait_thread);
if (p->p_siglist & sigmask(SIGKILL)) {
clear_wait(current_thread(), THREAD_INTERRUPTED);
sig_lock_to_exit(p);
signal_unlock(p);
exit1(p,signum, (int *)NULL);
return(0);
}
if (thread_should_abort(current_thread())) {
signal_unlock(p);
return(0);
}
signum = p->p_xstat;
if (signum == 0)
continue;
mask = sigmask(signum);
if (mask & threadmask)
ut->uu_sig |= mask;
else
p->p_siglist |= mask;
if (p->p_sigmask & mask)
continue;
}
switch ((long)p->p_sigacts->ps_sigact[signum]) {
case (long)SIG_DFL:
if (p->p_pptr->p_pid == 0) {
#if DIAGNOSTIC
printf("Process (pid %d) got signal %d\n",
p->p_pid, signum);
#endif
break;
}
if (prop & SA_STOP) {
if (p->p_flag & P_TRACED ||
(p->p_pgrp->pg_jobc == 0 &&
prop & SA_TTYSTOP))
break;
p->p_xstat = signum;
stop(p);
if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0)
psignal(p->p_pptr, SIGCHLD);
thread_block(0);
if (thread_should_abort(current_thread())) {
signal_unlock(p);
return(0);
}
break;
} else if (prop & SA_IGNORE) {
break;
} else {
p->p_siglist &= ~mask;
p->p_sigpending &= ~mask;
signal_unlock(p);
return (signum);
}
case (long)SIG_IGN:
if ((prop & SA_CONT) == 0 &&
(p->p_flag & P_TRACED) == 0)
printf("issignal\n");
break;
default:
p->p_siglist &= ~mask;
p->p_sigpending &= ~mask;
signal_unlock(p);
return (signum);
}
p->p_siglist &= ~mask;
p->p_sigpending &= ~mask;
}
}
int
CURSIG(p)
register struct proc *p;
{
register int signum, mask, prop, sigbits;
task_t task = p->task;
thread_t cur_thread;
thread_act_t cur_act;
int s;
struct uthread * ut;
int retnum = 0;
if (p->p_siglist == 0)
return (0);
if (((p->p_siglist & ~p->p_sigmask) == 0) && ((p->p_flag & P_TRACED) == 0))
return (0);
cur_thread = current_thread();
cur_act = current_act();
ut = get_bsdthread_info(cur_act);
sigbits = (ut->uu_sig | p->p_siglist) & ~p->p_sigmask;
for(;;) {
if (p->p_flag & P_PPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) {
return (retnum);
}
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
if (mask & p->p_sigignore && (p->p_flag & P_TRACED) == 0) {
continue;
}
if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
mask = sigmask(signum);
if (p->p_sigmask & mask)
continue;
return(signum);
}
switch ((long)p->p_sigacts->ps_sigact[signum]) {
case (long)SIG_DFL:
if (p->p_pptr->p_pid == 0) {
#if DIAGNOSTIC
printf("Process (pid %d) got signal %d\n",
p->p_pid, signum);
#endif
break;
}
if (prop & SA_STOP) {
if (p->p_flag & P_TRACED ||
(p->p_pgrp->pg_jobc == 0 &&
prop & SA_TTYSTOP))
break;
retnum = signum;
break;
} else if (prop & SA_IGNORE) {
break;
} else {
return (signum);
}
case (long)SIG_IGN:
if ((prop & SA_CONT) == 0 &&
(p->p_flag & P_TRACED) == 0)
printf("issignal\n");
break;
default:
return (signum);
}
sigbits &= ~mask;
}
}
void
stop(p)
register struct proc *p;
{
p->p_stat = SSTOP;
p->p_flag &= ~P_WAITED;
wakeup((caddr_t)p->p_pptr);
(void) task_suspend(p->task);
}
void
postsig(signum)
register int signum;
{
register struct proc *p = current_proc();
register struct sigacts *ps = p->p_sigacts;
register sig_t action;
u_long code;
int mask, returnmask;
#if DIAGNOSTIC
if (signum == 0)
panic("postsig");
if (cpu_number() != master_cpu)
panic("psig not on master");
#endif
signal_lock(p);
if (sig_try_locked(p) <= 0) {
signal_unlock(p);
return;
}
mask = sigmask(signum);
p->p_siglist &= ~mask;
action = ps->ps_sigact[signum];
#if KTRACE
if (KTRPOINT(p, KTR_PSIG))
ktrpsig(p->p_tracep,
signum, action, ps->ps_flags & SAS_OLDMASK ?
ps->ps_oldmask : p->p_sigmask, 0);
#endif
if (action == SIG_DFL) {
sigexit_locked(p, signum);
return;
} else {
#if DIAGNOSTIC
if (action == SIG_IGN || (p->p_sigmask & mask))
log(LOG_WARNING,
"postsig: processing masked or ignored signal\n");
#endif
if (ps->ps_flags & SAS_OLDMASK) {
returnmask = ps->ps_oldmask;
ps->ps_flags &= ~SAS_OLDMASK;
} else
returnmask = p->p_sigmask;
p->p_sigmask |= ps->ps_catchmask[signum] | mask;
if (ps->ps_sig != signum) {
code = 0;
} else {
code = ps->ps_code;
ps->ps_code = 0;
}
p->p_stats->p_ru.ru_nsignals++;
sendsig(p, action, signum, returnmask, code);
}
signal_unlock(p);
}
void
sigexit_locked(p, signum)
register struct proc *p;
int signum;
{
sig_lock_to_exit(p);
p->p_acflag |= AXSIG;
if (sigprop[signum] & SA_CORE) {
p->p_sigacts->ps_sig = signum;
if (coredump(p) == 0)
signum |= WCOREFLAG;
}
signal_unlock(p);
exit1(p, W_EXITCODE(0, signum), (int *)NULL);
}
void
bsd_ast(thread_act_t thr_act)
{
struct proc *p = current_proc();
struct uthread *ut = get_bsdthread_info(thr_act);
int signum;
unsigned int pc;
boolean_t funnel_state;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
if ((p->p_flag & P_OWEUPC) && (p->p_flag & P_PROFIL)) {
pc = get_useraddr();
addupc_task(p, pc, 1);
p->p_flag &= ~P_OWEUPC;
}
if (CHECK_SIGNALS(p, current_thread(), ut)) {
while (signum = issignal(p))
postsig(signum);
}
ast_off(AST_BSD);
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
psignal_vtalarm(struct proc *p)
{
boolean_t funnel_state;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
psignal_lock(p, SIGVTALRM, 1, 1);
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
psignal_xcpu(struct proc *p)
{
boolean_t funnel_state;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
psignal_lock(p, SIGXCPU, 1, 1);
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
psignal_sigprof(struct proc *p)
{
boolean_t funnel_state;
if (p == NULL)
return;
funnel_state = thread_funnel_set(kernel_flock, TRUE);
psignal_lock(p, SIGPROF, 1, 1);
(void) thread_funnel_set(kernel_flock, FALSE);
}
void
pt_setrunnable(struct proc *p)
{
task_t task;
task = p->task;
if (p->p_flag & P_TRACED) {
p->p_stat = SRUN;
if (p->sigwait) {
wakeup((caddr_t)&(p->sigwait));
task_release(task);
}
}
}